查询词典 BP

For the limitations of traditional algorithms that can not be reasonably accurately predict the traffic, we have adopted BP neural network and curvilinear regression algorithms. First, we use BP neural network to train on historical data and then use the curve of regression to predict various factors, and then forecast data into the trained BP neural network which has been trained well, you can get future traffic forecasts.

针对以上传统算法的局限性，采用BP神经网络与曲线回归耦合算法，用BP神经网络对历史数据训练，利用曲线回归对各因素待测年份之值预测，将各因素的预测值带入已训练好的BP神经网络中，即可得到未来交通量的预测值。

A multiplex PCR assay for detection of Escherichia coli O157:H7 was developed by using 3 sets of primers that specifically amplify segments of the rfbE、fliC and eaeA genes. The target genes fragment of the PCR assay were 291 bp, 625 bp and 368 bp, respectively. Analysis of 30 strains demonstrated that this PCR system was specific.

以编码大肠杆菌O157抗原的rfbE基因、编码H7抗原的fliC基因以及编码毒力因子的eaeA基因为靶基因，选择3对引物，建立并优化了检测大肠杆菌O157：H7的多重PCR体系，扩增产物分别为291 bp、625 bp、368 bp，采用30株细菌验证了该多重PCR具有特异性。

Results: No significant difference were found befween A and B or C and D group before administration of TMP. In compare with the control group, TMP might increse HR and CO but decrease BP. The most marded changes of BP and CO appeared immediately agter the administration of the drug and refurned to the same leoel as premedication 5-7min later. The ± LVdp/dtmax and Time- tenson- index decreased firstly and increased later, reached the peak at 5min. In AMI group no obvious changes was found in HR. but BP decreased and CO increased.

注药前各监测指标在A、B两组及C、D两组间均无显著性差异，与A组相比，TMP可使健康大鼠出现明显的HR增快，BP下降，以及CO的增加，BP和CO改变的最大值均出现在给药即刻，5～7分钟内逐渐恢复至给药前水平，±LVdp/dtmax和时间一张力指数为先降后升，5分钟时达最高峰；在AMI大鼠组，TMP对HR无明显改变，但出现BP下降和CO增加，对±LV dp/dt max和TTI只有短暂的抑制，l～3分钟后恢复至用药前状态，无增强作用。

In chapter 4, basing theories and methods of scientific visualization, and artificial neural network BP algorithm, we integrate the Visual C++, OpenGL graphics library and Excel VBA technique to develop the program of artificial neural network and to make the BP algorithm visually, this program works can be divided into four parts: Using C language to develop program about BP algorithm; Using Visual C++, develop the GUI Interface, make input parameter visually; Using OpenGL graphic technique to display the training sample point in three dimension; at last using Excel DDE technique display the error graphic tables in Excel system In chapter 5, on the view of engineering application, we establish new method of surface reconstruction basing artificial neural network, develop interface program between module and commercial CAD/CAM system, meantime deeply discuss some key problems, for example, setting up the base plane, using the API technique, cutting and editing surface boundary, and also discuss the more compliant problem: how to intersect surface, at end we finish the work of translation from our surface reconstruction module to commercial CAD/CAM system, then make reverse engineering system basing artificial neural network more useful.

第四章基于科学计算可视化理论，依据人工神经网络BP算法理论模型，综合Visual C++，OpenGL图形库以及Excel VBA等多项软件开发技术，编制了人工神经网络程序，实现了BP算法的可视化映射。具体工作分为四部分：利用C语言实现人工神经网络BP算法；利用VisualC++的GUI技术开发图形用户界面，实现参数设置可视化；利用OpenGL图形技术进行三维映射，显示学习样本及训练样本点；利用微软电子表格DDE动态数据交换技术，在Excel上动态显示学习误差曲线图。第五章从工程应用的角度出发，提出了一种新的基于人工神经网络算法的曲面裁剪重构方法，完成了曲面重建模块与通用CAD/CAM系统的接口设计工作，对其中的若干关键问题进行了深入讨论，例如基平面设定、API技术的应用、边界裁剪等问题，同时，对曲面计算中较为困难的曲面相交问题也进行的专门探讨，最终完成了曲面重建模块向CAD/CAM系统的数据传输工作，使人工神经网络逆向工程系统趋向实用。

The acquired gene was 603 bp in length, including 96 bp of 5' untranslated region, 222 bp of 3' untranslated region, and an open reading frame of 285 bp.

基因的5'非翻译区96 bp， 3'非翻译区222 bp，开放阅读框 285 bp，编码94个氨基酸，预计蛋白的分子量为9.9 kD，等电点为8.02。

Focusing on some disadvantages in standard BP algorithm, such as low convergence rate, easily falling into local minimum point and weak global search capability, Genetic algorithm is used to optimal the connection weight of BP Algorithm in this paper, and construct a GA-BP algorithm of evolutionary neural network, and the algorithm is applied to the control of BLDCM speed adjusting system.

针对标准BP算法存在全局搜索能力弱和易陷入局部极小点等缺点，本文将遗传算法与BP神经网络相结合，构造了一种新的进化神经网络GA-BP算法，并将该算法应用于无刷直流电机调速系统的控制，仿真结果表明，与传统的PI控制系统相比，该算法得出的电机控制曲线几乎无超调，与基于BP算法的速度控制系统相比较，具有收敛速度快、不易陷入局部极小的优点。

Sequence analysis and phylogenetical study showed that this cDNA contained 778 nucleotides, with a 627 bp open reading frame flanked with a 44 bp 5' UTR and a 107 bp 3' UTR. The encoded 208 amino acids housefly Attacin shared a high similarity of 50%~70% with that of the other dipterous insects. In addition, the phylogenetical analysis also indicated that the Attacin from housefly was in the same branch with those of other species, suggesting that they come from the same ancestor.

家蝇Attacin的cDNA全长778 bp，其中包括627 bp的开放式读码框，44 bp的5ˊ末端非编码区(5ˊUTR)和107 bp的3ˊ末端非编码区(3ˊUTR)，相应的蛋白产物含208个氨基酸；与其他双翅目昆虫的Attacin具有很高的相似性，约50%～70%；以邻接法(Neighbor-Joining，NJ)所构建的系统关系表明家蝇的Attacin与其他双翅目昆虫的Attacin起源于共同的祖先。

We theoretically investigated the effects of incorporating Ih, T-type Ca2+ current, sustained inward current, and/or low-voltage-activated L-type Ca2+ channel current on 1 creation of BP cells, 2 robustness of BP activity to electrotonic loads of nonpacemaking cells, and 3 BP cell ability to drive NP cells.

我们从理论上研究了合并Ih， T-型 Ca2+流，持续内向电流，和/或低电压激活的L-型Ca2+通道电流对1产生 BP细胞， 2 BP 活性对非起搏细胞电紧张负荷的稳定性，和 3 BP 细胞驱动 NP细胞的能力的作用。

By the comparison between archaeological stratigraphy, sediment characteristics of cultural layers and cultural interruptions, 46 ~(14)C chronological data of buried paleotrees and peat, the synthetical analysis of the distribution laws of sites, and the reference to the results from other scholars, we can see that there are 7 cultural interruptions in the three Gorges and 7 cultural interruptions in the Yangtze Delta. They are from the last stage of Chengbeixi Culture to the initial stage of Daxi Culture (7200～6000a BP)→the third stage of Guanmiaoshan Culture Style of Daxi Culture (5800～5500a BP)→the initial stage of Shangzhou Culture (4000～3500a BP )→the last stage of Shangzhou Culture (2500～2200a BP)→During the Song dynasty Culture (960-1276AD) During the Ming and Qing Culture (1368-1911AD) in the prehistorical and historical period in the three Gorges.

对长江三峡和长江三角洲考古遗址进行地层对比，考古遗址文化层和文化断层沉积特征、文化层的叠压关系、考古遗址淤砂和淤土层厚度、46处埋藏古树和39处泥炭的~(14)C年代统计数据和空间分布规律、文化遗址分布的时空变化规律等特征综合分析，发现长江三峡地区新石器时代到历史时期考古遗址地层中有7期文化断层：(1)城背溪文化末期到大溪文化初期(7200～6000a BP)；(2)大溪文化关庙山类型三期(5800～5500a BP)；(3)商周早期(4000～3500a BP)；(4)商周晚期(2500～2200a BP)；(5)宋代时期(960-1276AD)：(6)明清时期(1368-1911AD)；(7)近现代时期。

In the northern part of the Okinawa Trough,at about 7.5-7.0kaBP of the early Holocene, this studied region was controlled by the continental shelf water, and at about 7.0aBP Kuroshio water combined with continental shelf water intensively, then the region was controlled by the intensified Kuroshio water with upwellings during 7.0-6.0kaBP; from 6.0-2.0ka BP the upwellings developed stably and the thermocline gradually declined: from 6.0-5.0 kaBP the impact of the upwellings mainly focused on the thermocline and much less on the sea surface, from 5.0-4.0kaBP the SST decreased because the sea surface was influenced by the cool water brought by the intensified upwellings; from 2.0-1.2kaBP, the upwelling declined and the SST increased consequently; since 1.2 kaBP the upwelling increased and the thermocline declined obviously.

冲绳海槽北部、九州西南海区，全新世7.5-7.0ka BP陆源物质影响明显， 7.0kaBP前后黑潮侵入并与陆架水强烈混合，7.0-6.0ka BP期间黑潮影响逐渐控制了该区，上升流开始发生，温跃层开始变浅；约在6.0-2.0ka BP之间上升流持续稳定发育，温跃层深度逐渐下降：6.0-5.0ka BP上升流影响作用于温跃层但对表层影响较小，5.0-4.0ka BP海水表层温度受上升流冷水影响降低；而约2.0-1.2ka BP，上升流减弱，海水表层温度回升；近1200年来上升流加强、温跃层深度减小的趋势更加显著。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。